土体内柱形孔扩张问题的一般解及剪胀角的影响分析  

A General Solution for the Expansion of Cylindrical Cavity in Soil Mass and the Influence Analysis of Dilation Angle

作　　者：张光俊[1] 

机构地区：[1]江苏省阜宁县公路管理站,江苏阜宁224400

出　　处：《盐城工学院学报（自然科学版）》2008年第3期45-49,共5页Journal of Yancheng Institute of Technology:Natural Science Edition

摘　　要：根据土塑性力学的基本原理,在考虑材料剪胀性的情况下,解得了土体内柱形孔扩张时塑性区范围大小的理论计算公式,进而得到了柱形孔扩张时引起周围土体内塑性区和弹性区应力场和位移场的解析解。研究了剪胀角ψ对弹塑性交界处半径R的影响并给出了剪胀角的测试方法。通过算例研究发现,弹塑性交界处半径R随着剪胀角ψ的增大而逐渐减小,塑性区平均体积应变却随着剪胀角ψ的增大而增大。Based on the soil plastic mechanics, a formula for the plastic scope in the expansion of cylindrical cavity is presented with consideration of soil dilatancy. Then, the analytical solutions of the stress and displacement field are derived. It is shown that the angles of dilation have obvious effects on the radius of elastic plastic boundary. A testing method for dilation angle was given. It is proven by examples that with the increase of dilation angle, the radius R decreases gradually while the average plastic volumetric strain increases.

关 键 词：剪张角 柱形孔扩张 应力场 位移场 

分 类 号：TU411.7[建筑科学—岩土工程]